But what's the point? You install debian stable, where every library is at around 2 years old. Now you want run SomeApplication (Blender, Gimp, video games) as that's what you actually use your computer for.

If you wanted to run a 2 year old version of SomeApplication, that would work just fine. Is that what you really want? Is that what most users want?

If you instead install a snap/flatpack of the latest version of SomeApplication, you are installing also new libraries instead of the good old stable libraries your distro provides. So what's the point then?

> that's what you actually use your computer for

No, you use Debian stable for servers, embedded, and anything production-related that has to be stable.

You use Debian Sid for your playground or hobbies and it will be just as up to date as every rolling distro.